Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c20eee2496d904b…

MALICIOUS

PDF

42.9 KB Created: 2020-08-11 05:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef318adeab84895b8f9f9d0822191db1 SHA-1: c46b6fa6b6f164000438294d6b16610977b63412 SHA-256: 2c20eee2496d904b1334d98bd18a3a2559939cecc2f60d0f83eba2c36e23953b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, also contains the same redirector URL and numerous Shopify-hosted PDF links, suggesting an attempt to create a link farm for SEO poisoning or to distribute malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=stopping+by+woods+on+a+snowy+evening+pdf
    • http://files.elevatedaccounting.com/uploads/1/3/1/0/131070313/335eed9a8db.pdf
    • http://zekutirad.happyvalleyanimalsinneed.com/uploads/1/3/2/6/132682883/3113792.pdf
    • http://files.xcskiing.info/uploads/1/3/1/0/131070362/xoserat.pdf
    • http://files.otaracommunitychurchofthenazarene.com/uploads/1/3/1/3/131398406/xakaput.pdf
    • http://files.baselimmunology.com/uploads/1/3/1/4/131407051/6550292.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/24604705091.pdf
    • https://cdn.shopify.com/s/files/1/0437/9652/9314/files/jipavopojaxedapodovibeno.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/29888399358.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/idsa_guidelines_aspergillosis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/46248769094.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/redexofidalabogogotori.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/9131829286.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6324/files/sexepozedisirewegazozo.pdf
    • https://cdn.shopify.com/s/files/1/0448/5254/3649/files/digeke.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/panotofopibemuzaduxipu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/fozofupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/somerurunem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000693a.bin
a5ee40c6f1db747ff6085d185fd23ae937026fb4a3ff31a0feee7912b1bb44da
pdf-font-stream PDF embedded font (sfnt) at offset 0x693A 5580 bytes
font_01_sfnt_off00007c67.bin
5e7047194e033e0795672f7913a261d791aa3a343953e5202b98c03b2ea0e1fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C67 10096 bytes